How to form this geometric shape?

Question

This is maybe specific request. I need sketch of a figure with its dimension, that is to be made metal model of.
It has shape of a cone without its peek (cut of peek), and these are its specific dimension:

- base circle R=305 mm
- top circle R=278 mm
- distance between these two circles (the figure height) h=125 mm

I need something like a blue-print. That picture should be made in a way that, when drawn in metal, than cut off, scrolled and put together, form the shape I previos described.

thanks

Answer 1

The model you are describing is called as a 'frustum'. ( Imagine an inverted Bucket, with different diameters on either side of the cylinder.
Draw a oval on a paper. And a bigger oval below it.. Join the two extreme ends of the ovals, and you got a frustum

Answer 2

Draw a straight line 305 mm long. Now go up from there 125 mm and draw a line that is 278 mm long which has it's mid point matching the midpoint of the bottom line but spaced from it by the 125 mm. Now connect the ends of the lines. This is the shape you need to form in metal. When you join the edges, you should have your cone.